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    <title>Document</title>
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    <script>
    //     //编写函数map(arr) 把数组中的每一位数字都增加30%，并返回一个新数组

     var arr = [10, 100, 1000];  
     var news = []
     function map() {
       for(var i = 0;i<arr.length;i++){
        arr[i] *=1.3
        news.push(arr[i])
       }
       return news
     };
     var res = map(arr)
     console.log(res)
     // [13, 130, 1300]

     
    </script>
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